HomeMy WebLinkAboutLake Elmo Planting Irrigation Specification 32 84 00 CITY OWNED MAINTAINED 9.6.16Lake Elmo, MN
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SECTION 32 84 00
PLANTING IRRIGATION
PART 1 - GENERAL
1.1 DESCRIPTION
A. This section is fifteen total written pages plus related documents.
1. Refer to Lake Elmo Standard Details for more information
2. Refer to Lake Elmo City Code 50.40 – Water Use Restrictions – for more information
B. This section specifies elemental materials and procedures based upon published and widely
accepted industry best practices to design and construct landscape irrigation system(s) in a
design-build approach within designated areas that constitute city maintained spaces including
but, not limited to road rights-of-way.
1.2 SUBMITTAL
A. All irrigated right-of-way and city owned/maintained outlots shall to deliver 100% irrigation
coverage for all proposed landscape improvements excluding native seeding areas.
B. Landscape irrigation design(s) shall be crafted in workmanlike and reproducible fashion using
CAD-based software. Scaled irrigation plans shall include the entire project limits. Designs and
supporting documents shall be furnished in reproducible electronic and hardcopy fashion to the
City of Lake Elmo for approval as part of and at the same time as the planting design review
process.
1. No landscape irrigation installation work or the preparation for landscape irrigation
installation shall commence without written approval & consent of the City of Lake
Elmo, MN.
C. Landscape irrigation design(s) and supporting documents shall depict and describe all
components of the proposed landscape irrigation system including but, not limited to:
1. Water supply and detail including proposed enclosures and slabs
2. Pipeline sizing throughout
3. Sprinkler emitter proposed brand, model and nozzle sizing
4. Drip grids and/or micro irrigation components with associated required elements
5. Controls including proposed pedestal enclosures, weather-based appurtenances.
a. System master controller(s) shall be SMART controllers, labelled as conforming
to US EPA WaterSense® performance criteria and shall be installed and
programmed using SMART technology.
6. Projected seasonal water use month-by-month
7. Demonstration statistics indicating proof that the proposed landscape irrigation system
shall deliver adequate irrigation of the covered area(s) within all common or likely City-
imposed water use restrictions.
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8. Requirement of the installer to furnish to the City, not less than three complete
replacement assemblies of components including but, not limited to sprinkler emission
devices, control valves, decoders, quick couplers and quick coupler keys with hose
swivel.
9. Requirement of the installer to furnish to the City, not less than three complete booklets
in printed and electronic format, depicting product performance, operations and
maintenance, suggested system scheduling with suggested seasonal system scheduling
adjustments and field-ready reference maps, plans, station/zone designations.
10. Requirement that an installer meets or exceeds the Installer Minimum Qualifications.
a. See Section 1.6B
1.3 DEFINITIONS
A. Circuit Piping: Downstream from control valves to sprinklers, specialties, and drain valves.
B. Drain Piping: Downstream from circuit-piping drain valves.
C. Main Piping: Downstream from point of connection to water distribution piping to, and
including, control valves.
D. Low Voltage: As defined in NFPA 70 for circuits and equipment operating at less than 50 volts or
for remote-control, signaling power-limited circuits.
E. Station/zone: A group or area of sprinkler emission devices piped to operate simultaneously by
design and independently of other stations/zones.
F. Sprinkler/Sprinkler Emission device: An irrigation system component that is used to dispense
irrigation water to the landscape at a specific rate.
G. Application/Precipitation Rate: The rate at which water is applied to a given area by sprinkler(s)
and emitter(s), usually expressed as depth per unit time (inches per hour or mm per hour).
H. Nozzle/Nozzle orifice: The discharge emission point of a sprinkler installed to control the volume
of water discharge, distribution pattern and droplet size.
I. Matched Application/Distribution Rate: A best design and installation practice whereby
sprinklers on the same station discharge irrigation water at a rate that is matched to other
sprinklers within the station regardless of arc of throw onto the landscape.
J. Hydrozone: An area of an irrigation system where microclimate factors that influence the
watering schedule are similar including but, not limited to plant type, soil type, solar radiation,
slope and wind run.
K. Landscape: Any and all areas that are planted or installed and intended to receive irrigation
including but, not limited to turf grass, ground covers, shrubs, trees, flowers and similar plant
materials as opposed to agricultural crops grown and harvested for monetary return.
1.4 ABBREVIATIONS
A. FPT: Female pipe thread
B. MPT: Male pipe thread
C. NPT: National pipe thread
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D. HDPE: high-density polyethylene
E. PVC: Polyvinyl chloride plastic
F. SDR: Standard Dimension Ratio
G. SCH: Schedule Pipe
H. AWG: American Wire Gauge
1.5 ELEMENTAL REQUIREMENTS
A. Irrigation water supply shall primarily be derived of municipal source and it shall be metered.
1. Refer to City of Lake Elmo process for obtaining a water meter.
B. All water landscape irrigation supply(ies) and associated system mainline and circuit piping
regardless of water source, shall be:
1. sized not to exceed dynamic velocity greater than 5 feet per second and;
2. sized to enable simultaneous operation of not less than two stations of irrigation and;
3. sized to complete an irrigation cycle within 12 hours during the hottest month of the
irrigation season and;
4. sized to enable operation of sprinkler emission devices at manufacturer recommended
dynamic pressure(s).
C. All water supplies serving City-owned and maintained irrigation shall be designed and installed
to serve only the City-owned and maintained irrigation including but, not limited to:
1. the entire water supply including all piping below and above grade, pump equipment
and controls, meter(s), valves, backflow prevention assemblies, cabinets and all
elements leading up to and including connection to the City-owned and maintained
irrigation system and without any shared elements whatsoever with non-City owned
and maintained irrigation.
D. City –owned landscape irrigation systems shall be designed and installed to include Irrigation
system controls and emission devices exclusive to the Hunter brand.
E. Irrigation system control technology shall be digital, two-wire, with associated appurtenances
of one single manufacturer, designed and installed to meet or exceed manufacturer
recommendations and best practices including grounding and surge protection, that conform to
manufacturer recommendations and best practices at the time of design and/or installation.
F. Irrigation stations shall not mix rotor or multi-stream, multi-trajectory sprinklers with misting
spray-type sprinklers.
G. Broadcast sprinklers shall be placed to enable 100 percent coverage, sprinkler-to-sprinkler.
H. Turf areas shall have broadcast sprinklers.
I. Islands and planting beds shall have drip irrigation.
J. Broadcast sprinkler emission devices shall include matched application rates.
K. Broadcast sprinklers located at the bottom of slopes shall have integral check-valve or similar
features to prevent or reduce low-head drainage.
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L. Broadcast sprinklers shall not throw over public walks or roadways.
M. Broadcast sprinklers shall be placed and adjusted to minimize overspray onto hard surfaces.
N. Broadcast sprinklers in the vicinity of conifers shall be placed to minimize broadcast onto
conifers.
O. Sprinklers and piping installed upon slopes shall be installed perpendicular to the slope
wherever feasible.
P. System hydrozoning priority shall be given to soil type, plant type, topography and microclimate.
Q. Single row broadcast sprinklers shall be allowed in boulevard areas or strips of eight feet width
or less.
R. Single row broadcast sprinklers shall be placed to throw away from walks and toward streets.
S. Use schedule 40 PVC pipe or greater for sleeves under hard surfaces.
T. Sleeve(s) dimension shall be a minimum of two times the outside dimension of the pipe passing
through.
U. Use NSF-rated HD100 polyethylene pipe, where applicable.
V. Use up to 2” polyethylene pipe in sleeves.
W. Pressure main isolation valve with quick coupler immediately downstream shall be placed:
1. Immediately following each “TEE-end” of a looped mainline;
2. Prior to routing underneath any substantial hard surface such as a roadway, intersection
or similar;
3. At the point immediately following a directional change that results in “leg” or “stub”
lengths
X. Thrust block pressure pipe 3” or larger. Follow published industry best practices.
Y. Top of mainline pipe 3” and smaller shall not be less than 18” from final grade.
Z. Top of circuit piping shall be not less than 12” from final grade.
AA. Plan for and install controller, controller pedestal, corresponding electrical and field grounding
and surge equipment per manufacturer recommendations.
1.6 QUALITY ASSURANCE:
A. Products Criteria:
1. When two or more units of the same type or class of materials or equipment are
required, these units shall be products of one manufacturer.
2. Components including but, not limited to sprinklers and controls shall include a
nameplate bearing manufacturer's name or trademark, including model number which
shall be securely affixed in a conspicuous place on equipment. In addition, the model
number shall be either cast integrally with equipment, stamped, or otherwise
permanently marked on each item of equipment.
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3. All pipe and wire shall be permanently and continuously marked with product
information indicating conformity to minimum specified performance requirements.
4. Furnish proof of conformity and/or labelling of system master controller(s) with US EPA
WaterSense® performance-based criteria.
B. Installer Minimum Qualifications:
The installing contractor shall be an employer of workers that include not less than one Certified
Irrigation Contractor in good standing as accredited by The Irrigation Association, Fairfax, VA
and who shall be currently employed by the selected installing contractor and who shall
personally conduct or oversee the conduct of all work upon this project. The installing
contractor shall be registered in the State of Minnesota as a Technology Systems Contractor in
good standing employing not less than one Minnesota licensed Power Limited Technician in
good standing who shall be currently employed by the selected installing contractor and who
shall personally conduct or oversee the conduct of all low voltage irrigation electrical work.
C. System Requirements:
All calls-out described herein including but, not limited to 100 percent coverage of irrigated
areas, matched sprinkler application engineering and best practice-based hydrozoning are
required. The actual and spirit of intent of the project outcome shall be clearly indicated upon
the drawing sheets and within all specification documents. Project documents shall require that
the selected installing contractor shall at no additional cost to the City of Lake Elmo, make
minor adjustments necessary prior to installation of landscape material and/or prior to
acceptance of the irrigation system, to avoid obstructions such as hard surfaces signs, utilities
and light standards to achieve full and complete coverage of irrigated areas without overspray
on roadways, sidewalks, built features and shall protect trees from close high- spray velocity.
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PART 2 - PRODUCTS
2.1 PIPES, TUBES AND FITTINGS
A. PE pipe with controlled ID shall be ASTM F771, PE 3408 compound;
B. Insert fittings for PE pipe: ASTM D2609, nylon or propylene plastic with barbed ends. Include
stainless steel bands or other fasteners.
C. PE pressure pipe: AWWA C906, with DR of 7.3, 9, or 9.3 and PE compound number required to
give pressure rating not less than 160 psi (1100 kPa)
D. PE butt, heat-fusion fittings shall be ASTM D3261.
E. PE socket-type fittings shall be ASTM D2683.
F. PVC sleeve pipe: ASTM D1785, PVC 1120 compound, Schedule 40.
G. PVC socket fittings shall be ASTM D2466, Schedule 40 PVC threaded fittings: ASTM D2464,
Schedule 80.
H. Swing joints: Threaded fittings with elastomeric seals that allow 360 degree rotation, and
designed for minimum 200 psi (1375 kPa) working pressure, may be used in lieu of standard
threaded fittings.
I. PVC socket unions: Both headpiece and tailpiece shall be PVC with socket ends.
J. PVC Pipe: ASTM D2241, PVC 1120 compound, SDR 26.
K. PVC socket fittings: ASTM D2467, Schedule 80.
L. PVC socket unions: Both headpiece and tailpiece shall be PVC with socket or threaded ends.
2.2 PIPE JOINING MATERIALS
A. Solvent cements for joining PVC piping: ASTM D2564. Include primer according to ASTM F656.
B. Plastic, Pipe-Flange Gaskets, Bolts, and Nuts: Type and material recommended by piping system
manufacturer unless otherwise indicated.
2.3 VALVES
A. Valves shall be manufactured by Hunter
B. Underground Shut-Off Valves:
1. Butterfly valves 2 inches (50 mm) and larger: AWWA C504, iron body, bronze mounted,
double disc with parallel or inclined seats, non-rising stem turning clockwise to close, 150 psi
(1025 kPa) minimum working pressure and if below grade shall be contained in service
box(es) stacked or stand pipe with service box at surface installed in a workmanlike fashion
to enable usual and expected operation.
2. Ball valves, isolation valves, 1- inch (25.4 mm) and larger: Full-port ball valves with bronze
body, PTFE seats, and 90 degree on/off handle. Ball valves shall have NPT female end
connections, sized equivalent to the pipe being attached and if below grade shall be
contained in service box(es) stacked or stand pipe with service box at surface installed in a
workmanlike fashion to enable usual and expected operation.
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3. Isolation valves, 1-inch (25.4mm) and larger: Full port bronze valve with 2 inch (50 mm) nut
for T-Handle socket wrench operation., sized equivalent to the pipe being attached and if
below grade shall be contained in service box(es) stacked or stand pipe with service box at
surface installed in a workmanlike fashion to enable usual and expected operation.
B. Operations:
1. Underground applications shall use valves with 2 inch (50 mm) nut for T-Handle socket
wrench operation
2. Above ground and valve pit applications shall use valves, with T-handles or if 3-inch or
larger, handwheels.
3. Valve ends shall accommodate the type of main pipe adjacent to valve.
C. Remote Control Valves:
1. All remote control valves shall be of the manufacturer and models indicated on the
drawing sheets furnished. No deviation from manufacturer or model call-outs once
approved, shall be allowed.
a. Sizes and locations as indicated on the drawing sheets. Molded-plastic body,
furnished as straight or angle pattern type, normally closed diaphragm type
with manual shut off and flow control adjustment. Refer to sample details or
furnished and approved details submitted at the time of approval application.
b. Single valve digital two-wire decoder installed concurrently with each remote
control valve and within the same remote control valve box, one valve per
decoder, one decoder per control valve, one valve box per valve and decoder
combination. No deviation from manufacturer or model call-outs once
approved, shall be allowed. Refer to sample details or furnished and approved
details submitted at the time of approval application. Label decoders with
stencils designating controller and circuit number with permanent white
epoxy paint or with permanent paint pen or other permanent means and in a
workmanlike fashion.
2. Valves shall have a minimum of 150 psi (1025 kPa) maximum working pressure.
3. Each sprinkler station shall be automatically operated by a remote control valve
installed underground and operated by a single-station in-line digital decoder-governed
solenoid.
4. Valve boxes shall be locking type-capable.
5. Valves shall be completely serviceable from the top without removing valve body from
the system. Valves shall operate at no more than 7 psi (50 kPa) pressure loss at
manufacturers maximum recommended flow rate.
6. Valves shall be diaphragm type designed to operate in water containing sand and debris
and shall have a self-cleaning type contamination filter to filter all water leading to the
solenoid actuator and the diaphragm chamber.
D. Provide three (3) additional valves of each size used to City Public Works Department for future
use.
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2.4 VALVE BOX
A. Isolation valve boxes shall be precast concrete boxes with a compressive concrete strength in
excess of 4000 psi (30 Mpa). Box dimension shall be adapted to depth of cover required over
pipe at valve location. Mark box cover to say “Irrigation” and set flush with finished grade.
Provide 2 (two) "T" handle socket wrenches of 5/8 inch (15 mm) round stock with sufficient
length to extend 2 feet (600 mm) above top of deepest valve box cover.
B. Irrigation control valve, decoder boxes and quick coupler boxes shall be HDPE green in color or
black body with green cover. Boxes shall be lockable-ready. Refer to sample details or furnished
and approved details submitted at the time of approval application.
C. Provide 1 (one) additional valve box of each size used to City Public Works Department for
future use.
2.5 BACKFLOW PREVENTER
A. Use reduced pressure zone backflow prevention assembl(ies) sized to accommodate minimum
system performance specifications contained herein and as approved in writing by the City of
Lake Elmo. Refer to Lake Elmo standard details.
2.6 WATER METER
A. Use water meter brand and model specified by the City of Lake Elmo. Size meter according to
minimum system performance specifications contained herein. Refer to sample details or
furnished and approved details submitted at the time of approval application.
B. Refer to City of Lake Elmo process for obtaining a water meter.
2.7 PLUMBING ENCLOSURE AND SLAB:
A. The enclosure shall house the backflow prevention assembl(ies), water meter(s) and booster
pump(s), if required for a given project. Enclosure shall be mounted on a concrete slab of
minimum 4” depth with sleeve openings for water lines and booster pipe electrical wires, if
applicable. The slab shall extend beyond the enclosure a minimum of 6”. All piping in and out
of the enclosure shall be copper and/or brass and/or threaded galvanized steel and/or Victaulic-
grooved pipe and shall extend beyond the slab a minimum of 5 feet before converting to other
pipe material.
B. Enclosure shall conform ASSE 5110, 5130 and related, for backflow prevention assembly
clearances.
C. Enclosure shall be constructed of 14 gauge all steel construction (minimum) and include the
following:
1. Gas shock supports for cover.
2. Lockable Hasp
3. Lift handles on cover.
4. 2” flanges bent top and bottom.
5. Louvers both ends for ventilation.
6. Painted “Transformer Green”.
7. Stainless Steel hinges.
8. Dimensions based on plumbing needs. Shall have a minimum 2 foot working distance
between plumbing and all enclosure walls.
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D. Design & Shop drawings listing all components, slab location, slab penetrations and steel
enclosure shall be furnished for review and approval prior to ordering parts or commencing
construction of this element.
E. Provide 6” minimum clearance from all valves, meters, backflow prevention assembly(ies), and
piping for serviceability and conform to Item 2.7b above.
F. Unless otherwise approved in writing by the City of Lake Elmo and prior to commencing design
work or installation, only one water supply point of connection shall be permitted per
development. If development is planned to be comprised of multiple phases of construction, all
phases shall be master planned and sized for one water supply point of connection unless
otherwise approved in writing by the City of Lake Elmo.
G. Water supply, slab and enclosure shall be placed within dimensional requirements of the City of
Lake Elmo from curbs, walks, utilities and related and location(s) shall be approved in writing to
accommodate rights-of-way clearance requirements during the design phase of work and prior
to commencing installation. Refer to City of Lake Elmo road right-of-way guidance.
2.8 AUTOMATIC CONTROL EQUIPMENT - INDEPENDENT ELECTRIC CONTROLLER WITH NO FLOW
SENSING (FOR SMALL INSTALLATIONS)
A. Controller, rain sensor, and decoders shall be manufactured by Hunter
B. Controller, controller pedestal with lockable stainless steel cabinet and slab shall be placed
within dimensional requirements of the City of Lake Elmo from curbs, walks, utilities and related
and location(s) shall be approved in writing to accommodate rights-of-way clearance
requirements during the design phase of work and prior to commencing installation. Refer to
City of Lake Elmo road right-of-way guidance.
C. Irrigation control shall be digital, two-wire-based automatic operation including:
1. Rain sensing technology, placed per manufacturer recommendations and/or referenced
industry best practices to interrupt irrigation during periods of sufficient moisture and
fully engaged;
2. Weather-based adjustment, placed per manufacturer recommendations and/or
referenced industry best practices and fully engaged;
3. Controller shall be mounted in/on a pedestal manufactured by the selected controller
manufacturer and shall be securely placed upon a concrete base per manufacturer
recommendations and/or referenced industry best practices; See associated sample
detail(s).
4. Field control valves shall be connected to digital control wire using one-station field
decoders, placed in the associated control valve box and shall include waterproof wire
fittings such as 3MDBR or equivalent on the signal input wires and the signal output
wires. Follow manufacturer recommendations and/or referenced industry best
practices. Field control valves shall be placed in plastic/composite surface boxes, one
valve per box, minimum 10” round sized and in a fashion to prevent damage from
surface activities and to enable basic field maintenance without requiring of the box.
See associated sample detail(s).
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D. The independent electric automatic control system shall consist of one digital two-wire decoder-
based controller located in a stainless steel pedestal manufactured by the controller
manufacturer, which operates individual remote control decoder-based valves and weather-
based schedule adjustment (SMART) operation in accordance with timing schedules
programmed into the independent unit. Refer to sample details or furnished and approved
details submitted at the time of approval application.
E. Connect, test electrically and program all irrigation stations to the digital two-wire decoder-
based controller per manufacturer recommendations and best practices and incorporate all
stations into the control system. Memorialize all programming data onto reproducible
documents in a workmanlike fashion.
F. Provide three (3) additional decoders to City Public Works Department for future use.
2.9 SPRINKLERS
C. Sprinklers shall be manufactured by Hunter
D. Rotary pop-up sprinklers:
1. ¾” inlet, closed-case, gear-driven, 4” minimum pop-up height or
2. ½” inlet spray-body mounted, six-inch minimum pop-up height, multi-stream, multi-
trajectory rotating nozzle.
3. Matched precipitation/application shall be depicted on plan submittals and practiced at
the time of installation. Placement appropriate to the area characteristics being
watered.
4. Refer to sample details or furnished and approved details submitted at the time of
approval application.
B. Spray-type sprinklers (fixed):
1. ½” inlet, 4” minimum pop-up height with nozzles and placement appropriate to the area
characteristics being watered.
2. Refer to sample details or furnished and approved details submitted at the time of
approval application.
C. Provide three (3) additional sprinklers of each type used to City Public Works Department for
future use. Provide ten (10) additional nozzles of each type/size used to City Public Works
Department for future use.
2.10 QUICK COUPLERS
A. Quick Couplers shall be manufactured by Hunter
B. Quick couplers shall have all parts contained in a two-piece unit and shall consist of a coupler
water seal valve assembly and a removable upper body to allow the spring and key track to be
serviced without shut down of the main.
C. Metal parts shall be brass.
D. Lids shall be lockable vinyl covered and have springs for positive closure on key removal.
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E. Each quick coupler shall be contained in valve boxes. Refer to sample details or furnished and
approved details submitted at the time of approval application.
F. Furnish 1 (one) hose swivel and operating key for every two quick couplers.
G. Provide three (3) additional quick couplers to City Public Works Department for future use.
2.11 LOW VOLTAGE CONTROL VALVE WIRE
A. Wire shall be solid copper wire, Underwriters Laboratories Inc. approved for direct burial and
approved by the specified irrigation control manufacturer for use in digital two-wire decoder
based irrigation control systems. Size of wire shall be consistent with manufacturer
recommendations and not less than 14 AWG.
2.12 WIRE SPLICING MATERIALS: LOW VOLTAGE RATED UV RESISTANT MOISTURE-RESISTANT GREASE-
FILLED POLYPROPYLENE TUBE
A. 3M DBR/Y-6 Direct Bury Splice Kit UL486D-approved for direct burial in ground or equal. Use
upon all wire splices including but, not limited to decoder inlet wiring and decoder outlet wiring.
2.13 SLEEVE MATERIAL
A. ASTM D2241, PVC Schedule 40.
PART 3 - EXECUTION
3.1 PREPARATION
A. CALL BEFORE YOU DIG (811).
B. Examine proposed irrigation areas for compliance with requirements and conditions affecting
installation and performance.
C. Verify limits of irrigation and compare against approved plans.
3.2 PIPE INSTALLATION - GENERAL
A. Layout work as closely as possible to drawing sheets.
B. Install sprinkler lines to avoid electric, storm and sanitary sewer lines and existing water and gas
mains, all of which have the right of way.
C. Existing sidewalks and curbs shall not be cut during trenching and installation of pipe. Install
pipe under sidewalks and curbs by jacking, auger boring, or by tunneling. Repair or replace any
cracked concrete, due to settling during the warranty period.
D. Do not lay pipe on unstable material, in wet trenches weather conditions are unsuitable for
work.
E. Allow a minimum of 3 inches (80 mm) between parallel pipes in the same trench.
F. Clean the interior portion of pipe and fittings of foreign matter before installation. Securely
close open ends of pipe and fittings with caps or plugs to protect fixtures and equipment against
dirt, water and chemical or mechanical injury. At completion of all work thoroughly clean
fixtures, exposed materials and equipment.
G. The full length of each section of (PVC) pipe shall rest upon the pipe bed with recesses
excavated to accommodate bells or joints. Do not lay pipe on wood blocking.
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H. Hold pipe securely in place while joint(s) is/are being made.
I. Do not work over, or walk on, pipe in trenches until covered by layers of earth, well tamped, in
place to a depth of 12 inches (300 mm) over pipe.
J. Irrigation lines and control wire shall run through designated lanes where possible. Refer to
sample details or furnished and approved details submitted at the time of approval application.
K. Concrete thrust blocks shall be installed upon piping 3-inch and larger where the irrigation main
changes direction at “L” and “T” locations and where the irrigation main terminates. Do not
pressurize pipe for a period of 36 hours following the completion of pouring of the thrust blocks.
Concrete thrust blocks for supply mains shall be sized and placed in strict accordance with the
pipe manufacturer's specifications and shall be of an adequate size and so placed as to take all
thrust created by the maximum internal water pressure. Thrust block material shall not be
poured over and around pipe and /or control wire.
L. Minimum cover over lines under constant pressure shall be 18 inches (750 mm) for pipe sizes of
3 inch and less. Cover laterals to minimum depth of 12 inches (600 mm).
M. Quick couplers, properly anchored/secured in surface boxes shall be placed at the termination
of all main line piping.
3.3 SLEEVE INSTALLATION
A. Furnish and install where pipe and control wires pass under walks, paving, walls, and other
similar areas.
B. Sleeves to be twice line size or greater to accommodate retrieval for repair of wiring or piping
and shall extend 12 inches (300 mm) beyond edges of paving or construction.
C. Bed sleeves with a minimum of 4 inches (100 mm) of sand backfill above top of pipe in areas
where pipe is placed prior to hardscape is installed.
3.4 VALVE INSTALLATION
A. Group remote control valves wherever possible and aligned at a set dimension back of curb,
sidewalk and/or along roads.
B. Pressure main isolation valve with quick coupler immediately downstream shall be placed:
1. Immediately following each “TEE-end” of a looped mainline;
2. Prior to routing underneath any substantial hard surface such as a roadway, intersection
or similar;
3. At the point immediately following a directional change that results in “leg” or “stub”
lengths
C. No valves shall be set under roads, pavement or walks.
D. Clean interior of valves of foreign matter before installation.
E. Set valve box cover flush with finished grade.
F. Control valves shall never be less than 3 inches (80 mm) below finished grade. Refer to
minimums depicted herein and see sample details.
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3.5 SPRINKLER AND QUICK COUPLER INSTALLATION
A. Place part circle rotary sprinklers no greater than 6 inches (150 mm) from edge of and flush with
top of adjacent walks, curbs, and mowing aprons, or paved areas at time of installation.
B. Install all sprinklers using swing joints or flexible hose-and-fitting joints (a.k.a. swing pipe). Refer
to sample details included with this written specification.
C. Install all quick couplers on swing joints. Stake for support. Refer to sample details included
with this written specification.
D. Set shrub sprinklers 4 inches (100 mm) above grade or even with bedding mulch depth and 4
inches (100 mm) from edge of curb or pavement. Place 4 inches (100 mm) from walls. Stake
sprinklers prior to backfilling trenches. Support stakes shall be parallel to riser.
3.6 AUTOMATIC IRRIGATION - CONTROL SYSTEM INSTALLATION
A. Attach new stations of irrigation to the digital two-wire decoder system and program and test
each control valve for proper operation from the existing irrigation controller.
B. Adjust master controller programming to incorporate new stations of irrigation within programs
for similar plant-types or hydrozones and in accordance with necessary programming for
weather-based (SMART) operation.
3.7 CONTROL WIRE INSTALLATION
A. Wiring shall be located in trench with pressure main pipe. Splicing shall be held to a minimum. In
the event a wire splice is required outside of a remote control valve location, the splice shall be
contained in a valve box not smaller than 10” round with not less than 24 inches of leader or
expansion looping on each end of the splice. Use 3M DBR waterproof wire splices or equivalent.
B. Provide 12 inch (300 mm) expansion loops in wiring at each wire connection or change in wire
direction. Provide not less than 24 inch (600 mm) loop at remote control valves.
3.8 FIELD TEST AND QUALITY CONTROL
A. Tests and Inspections:
1. Pressure test pressure main line(s) before joint areas are backfilled. Backfill a minimum
of 12 inches (300 mm) over the pipe to maintain pipe stability during test period.
2. Inspect each joint and repair leaks.
3. Flush lines before installing sprinkler heads and quick couplers.
4. After installation, charge system and test visually for leaks. Repair leaks and retest until
no leaks exist.
5. After electrical circuitry has been activated and final adjustment of sprinklers to
permanent level at ground surface is complete, test each broadcast turf sprinkler
section to indicate a uniform distribution within any one sprinkler area and over the
entire area.
6. Operate controller and automatic control valves to demonstrate the complete and
successful installation and operation of all equipment.
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7. Test and adjust controls and safeties. Replace damaged and malfunctioning controls and
equipment.
8. Prepare test and inspection reports, programming information (including SMART
operation), decoder information and details for record drawings. Furnish records in a
professional and workmanlike fashion.
3.11 ADJUSTMENTS
A. Adjust settings of controller as needed during the establishment period. Should plant
establishment requirements preclude engagement of weather-based (SMART) operation, assure
weather-based operation is engaged prior to final walkthrough/turnover.
B. Adjust automatic control valves to provide flow rate at rated operating pressure required for
each sprinkler circuit.
C. Adjust sprinklers and devices to proper grade, radius and arc.
3.12 DEMONSTRATION AND DOCUMENTATION
A. Program controller for weather-based (SMART) operation.
C. Follow manufacturer's instructions and industry best practices.
D. Maintain and provide a complete set of as built drawings in a professional and workmanlike
presentation form which shall be corrected to show changes in locations of all pipe, valves,
pumps, decoders and related irrigation equipment.
E. Controller Drawings and Zone Chart(s):
1. Prepare in electronic format a drawing mapping the location of all valves, decoders,
lateral lines, and route of the control wires. Identify all valves as to size, station, number
and type of irrigation. Digital formatted "as built" drawings may require approval before
controller zone charts are prepared.
2. Provide one controller zone chart for each automatic controller showing the area
covered by the controller. The chart shall be a reduced drawing of the actual "as built"
system and fit the maximum size controller door or pedestal will allow. If controller
sequence is not legible when the drawing is reduced to door size, the drawing shall be
enlarged to a size that is readable and placed protected from elements (such as
laminated) inside the controller door.
3. The final irrigation “as built” drawings shall be submitted in digital format with a
different coding to show area of coverage for each station. All drawings and zone charts
must be completed and approved prior to final inspection of the irrigation system. Upon
completion, a full set of reproducible, electronic as-built drawings, decoder information
and base weather-based (SMART) programming shall be furnished to the City of Lake
Elmo.
3.13 WARRANTY
A. For a period of two (2) years from the date substantial completion and written final acceptance
of work performed under this Section, the Contractor shall promptly furnish and install any and
all parts and equipment that are defective in material, workmanship, or installation or have
been damaged at no additional cost to the City.
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B. During all the operation seasons of the two (2) year warranty period (which may end up being
more than 2 times), the Contractor shall drain and winterize the entire irrigation system(s) in
autumn at no additional cost to the City.
C. During the warranty period, the Contractor, at no additional cost to the City, shall perform the
spring system startups and complete system walkthrough and adjustment. Contractor shall
replace components damaged or faulty due to defective materials or workmanship at no
additional cost to the City.
D. It shall be the Contractor’s responsibility to ensure and guarantee complete coverage of the
areas depicted on the drawings to be irrigated, without overthrow onto streets, walks,
driveways and built features. The Contractor shall also guarantee the satisfactory operation of
the entire system. The entire system shall be warrantied to be complete and perfect in every
detail for a period of two years from the date of written final acceptance of work.
E. All materials and equipment furnished under this contract shall be new. For warranty and
support purposes, materials used upon this project (including but not limited to sprinklers,
valves, controls, pipe, fittings and related goods) shall be purchased from a local authorized
manufacturer representative-distributor.
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